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Permanent. They are UV resistant for like 5 years and resistant to wind born particle abbrasion.
If you were in the DE/PA/NJ area I could get you the name of the supplier.
Be very careful of sandbags on structures... not only for the obvious reason that they could fall of and land on someone.. but the structure may not be able to hold that kind of static (stationary) load.
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KD2BLZ
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